Calculation of Cooling Fans' Heat Dissipation and Air Flow

The air flow and air pressure of the cooling fan are important parameters in engineering that are used for effective heat dissipation. Let's discuss how to calculate them.

1. How do you calculate cooling air flow (Q) rate?

Air flow represents the air volume driven per unit time. The greater the air flow, the more heat can be carried away, thereby improving the heat dissipation efficiency. The calculation formula of air flow is as follows:

Air flow (Q) = (\ frac {1} {\ Delta t}) (unit: CFM)

Air flow (Q) = (\ frac {0} {\ Delta t}) (unit: CMM)

(\ Delta t) refers to the difference between the temperature of the air expelled by the fan and the ambient temperature. For example, if a CPU with thermal power expels air at a temperature of 38 degrees Celsius in a room with a temperature of 28 degrees Celsius, a fan with an air flow of 11.2 CFM fan is required. If the temperature difference is 2 degrees, then a fan with an air flow of 57.2 CFM is needed.

2. How do you calculate cooling air flow pressure (P) rate?

Air pressure indicates the force exerted by the fan on the air. It is related to the wind speed and the fan area. The calculation formula of air pressure is as follows:

Air pressure (P) = (\ frac {\ rho \ cdot V^ 2} {2})

(\ rho) is the air density and (V) represents the wind speed. The relationship between air pressure, air flow and wind speed can be clarified by this formula.

If you're still unsure of which cooling fan to get and how to calculate the air flow and pressure correctly, WELLSUNFAN can help you make the right choice. Our experts will ask for more details about your needs and budget so we can help you make the best decision for your business.

Why Choose WELLSUNFAN for Your Cooling Solutions

When precision in thermal management matters, WELLSUNFAN stands as your trusted partner with over a decade of engineering excellence in cooling fan technology.

Engineering Expertise You Can Rely On

Certified Quality: UL, ETL, TUV, and CE certified products adhering to ISO9000/14001 standards
Advanced Capabilities: 10,000㎡ production facility with 8 assembly lines and 60 injection molding machines
Global Precision: Fans rigorously tested using noise/airflow analyzers, ROHS testers, and environmental chambers